/Engine/Source/Runtime/GeometryCore/Public/DynamicMesh/MeshIndexUtil.h
the ID of the shared edge betwen two given triangles, orIndexConstants::InvalidIDif not found / invalid input
namespace UE { namespace Geometry { int32 UE::Geometry::FindSharedEdgeInTriangles ( const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, int32 Triangle0, int32 Triangle1 ) } }